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전력 보조서비스 제공을 위한 전기자동차 충 / 방전 최적화
김욱원(Wook-Won Kim),신홍열(Hong-Yul Shin),김진오(Jin-O Kim),김규호(Kyu-Ho Kim) 대한전기학회 2014 전기학회논문지 Vol.63 No.8
Electric vehicles should be connected to power system for charge and discharge of battery. Besides vehicle"s battery is charged for a power source, it is also reversibly possible to provide power source from battery to power system. Researches on battery usage for regulation resources have been progressed and could cause cost increase excessively because they distribute regulation capacity equally without considering the battery wear cost of SOC, temperature, voltage and so on. This causes increase of grid maintenance cost and aggravate economical efficiency. In this paper it is studied that the cost could be minimized according to the battery condition and characteristic. The equation is developed in this paper to calculate the possible number of charge and discharge cycle, according to SOC level and weighting factors representing the relation between battery life and temperature as well as voltage. Thereafter, the correlation is inferred between the battery condition and wear cost reflecting the battery price, and the expense of compensation is decided according to the condition on battery wear-out of vehicle. In addition, using realtime error between load and load expectation, it is calculated how much regulation capacity should be provided.
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